PRCI NG-18 Report 217

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Stress Corrosion Cracking Life Prediction Model (SCCLPM) Version 1.0 User's Manual and SoftwareLeis, Brian N., T. P. Forte, and N. D. GhadialiPipeline Research Council International / 01-Nov-1995 / 37 pages

L51808e
Battelle Memorial Institute
Need: Pipeline Research Council International, Inc.initiated a series of studies directed at better understanding the effect of the operating conditions on external stress-corrosion cracking (SCC) of gas-transmission pipelines. This work focused on so-called high-pH (pH ~ 9.3) cracking. It began with consideration of laboratory data based on the premise that, if one could not rationalize the results for various types of lab experiments, it would be difficult (if not impossible) to use such data as the basis to assess field cracking behavior. Success in blind predictions using "discriminating laboratory test conditions" led the committee in late 1990 to adapt the model developed for laboratory conditions to pipeline problems in the form of a personal-computer (PC) based model.
Benefit: This report presents the first generation model for axial SCC in pipelines that was developed to meet the challenge of Task SCC 8.0-90. The model makes use of the PRCI ductile flaw growth model (DFGM) to deal with the possible crack extension during hydrotest events and to serve as the failure criterion. This failure criterion is used in the form of PAFFC (Pipe Axial Flaw Failure Criterion), a software-based failure criterion based on the DFGM. This failure criterion characterizes failures that are controlled by a single or dominant flaw, whereas failures at SCC leaks and breaks often involve multiple, deep, parallel, and interacting cracks, which may adversely affect the quality of the predictions. Because of the database available for the properties involved, the model represents the behavior of a site along a typical X-52 pipeline.
Result: The SCCLPM software can be used to assess parametrically the effects of operating conditions (such as temperature, peak pressure, and cyclic pressure) on cracking behavior. Results are given in terms of the time to failure, failure pressure, and corresponding size of the flaw at failure. The SCCLPM model makes use of the PRCI ductile flaw growth model (DFGM) to deal with the possible crack extension during hydrotest events and to serve as the failure criterion. It also includes fixed functions to account for factors that control SCC kinetics, such as cyclic softening.




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